300 wby vs a 308win

[experthunter017]

My 300 Wby mag is a weatherby mark V with a 28 in barrel, I am shooting 178 A-max with 84grains of H-1000 with a Federal primer 215. I am getting a velocity average of 3050FPS, I am at sea level and I was shooting on a day with a tem. of about 80 degrees. Now my buddy is shooting a Remington 700 308 Winchester 26in barrel and is shooting a 178 A-Max with 43grains of varget with a federal gold medal match primer at sea level on a 80 degrees day , and he is getting a velocity of a average of 2950 FPS. Now here is my question I am shooting double the powder with very little velocity change, so why should I even be shooting a 300 WBY Mag when I can get almost the same results out of a rifle that would be cheaper to shoot since I would be getting more out of a pound of powder, and also what is the advantage of having a 300 wby. vs a 308, any input would be great.

 

[KydeX]

Have you seen your friends results? I am running a 155 grs bullet in .308 at around 2850 in a 26" barrel in the same temperature. This is quite a hot load. I think a 178grs bullet in a .308 would be closer to 2500-2600 fps.

Still, it would depend on what you're shooting at. If you don't need the extra punch of the .300, then yes, it is cheaper and easier to shoot the .308.

 

[gunsnjeeps]

You can shoot a much heavier bullet than a .308 Winchester. You can shoot a 240 grain bullet at 2700 fps, the .308 can shoot a 200 grain bullet at 2400 fps. You can get the same 200 grain bullet upto 3100 fps. According to Sierra you can get a 180 grain bullet up to 3200 fps. Velocities from Sierra they are very much ball park.

The advantage isn't that you can match the .308 with almost twice the powder but that you can beat the .308 but it takes twice the powder to do it. Think of how much fuel a dragster can burn in a quarter mile compared to a VW doing a quarter mile.

Some of your powder is burning to fill the extra case volume some is burning to move the powder. To quote Sierra, "While it is a fairly flexible cartridge to load for, the 300 Weatherby is at its best with bullets of 180 grains or heavier and very slow-burning powders."

 

[Desert Fox]

2950 fps with 178 A-Max in 308? I doubt it.

 

[bcrich]

2,950 ???? Your chronograph is bullshitting you!

 

[buffybuster]

shooting a Remington 700 308 Winchester 26in barrel and is shooting a 178 A-Max with 43grains of varget with a federal gold medal match primer at sea level on a 80 degrees day , and he is getting a velocity of a average of 2950 FPS.

No Way....Not from that load...and not without keeping all his fingers.

2650fps, yes

 

[ZLBubba]

Trust the emerging consensus... there's no way in hell his 308 is shooting 178gr pills that fast, not without a 40" barrel.

 

[Engine 22]

I'm with these guys ^----. It seems as though you are running a light load in your Whby to boot. I have a 300WM that pushes the 180's around 3100, so theoretically, you should be a bit faster that my 300WM, say 3200//.

 

[sic65stang]

I am the "buddy" expert is referring to. It is not a 178 amax at those loads that produced those velocities.

The load he is referring to is a 175 SMK with 47.5 CFE 223 that produces velocities of 2950. This is a very hot load. I came across these velocities wile doing a load test for that combination. I dont use it because although it is accurate sub 500, for whatever reason (probably pushing too fast?) it opens up at greater distance and I experienced heavy bolt lift on a very hot day.

I would seriously expect similar velocities with the same load with 178. I have not tried it. The above velocities were documented on several occasions and I can assure you happen.

 

[308Gunner]

Holy shit thats smoking, 200fps faster than I am pushing a 175SMK when you slowed it down what did groups look like at range.

 

[Wildboarem]

I think the h1000 may be a bit slow burning with the 178. 74 gr of rl 22 push a 180 Barnes Ttsx over 3150 in my 300 wby. The h1000 will shine with the 200+ bullets as does 7828.

Sent from my KFTT using Tapatalk 2

 

[pawprint2]

Big time- apples to fire bricks! The loads discussed in the 308 are extremely overpressure and not safe. The loads discussed for the 300wby are well within the safe load ranges published by reputable sources. If you were to take the Weatherby up to the same unsafe, stupid pressures (as a percent of the Max Average Pressure, SAAMI) you too, would have large gains in velocity.

 

[former naval person]

BS. Run the drop tests. JMHO

 

[sic65stang]

I did get pretty good groups with it. I didnt mess with the CFE much further. For those of you skeptics, I am glad I keep immaculate records.

GRAFS / SMK 175 CFE 223 45.5 Fed 210M 1.623 2.810 2769FPS
GRAFS / SMK 175 CFE 223 46 Fed 210M 1.623 2.810 2814FPS 0.54"@100
GRAFS / SMK 175 CFE 223 46.5 Fed 210M 1.623 2.810 2858FPS
GRAFS / SMK 175 CFE 223 47 Fed 210M 1.623 2.810 2880FPS
GRAFS / SMK 175 CFE 223 47.5 Fed 210M 1.623 2.810 2953FPS 0.74"@100

IMR online lists the max for CFE at 47.5, I went to that. IMR lists this MAX at 2750FPS and 60400psi (I dont know what they use, but I have a 26") Did I pop primers, no, were they flat, slightly, did I feel uncomfortable in 100+degrees with heavy bolt lift at a match, yes (1Kmatch adjustment from zero, 8.2 MIL, I would say that confirms drop).

For you guys who dont believe it, I would like you to try CFE with whatever bullet you like and see what velocities you get. EVERY load I have tried it with in 308 has produced exceptional velocities, in multiple rifles. Is it my favorite, no.